Paper-pulp-screen box.



PAPER PULP SGRBENVIAOX. APPLIUATION PILBD rsng''ffum. v lPatented Sept. 22, 1908. l 2 SHEETS-SHEET 1.

III

I Ill IIII II I lI I I'II III

III

III

im I I l III IIIIIII Il v m1 II I lI I n: n, inumana', l.;

J. JANsoN. i PAPER PULP SCREEN BOX. Y

' APPLIOATION FILED PEB. 25, 1907. 899,169. t Patented sept. 22, 1908.

2 SHEETS-SHEET 2..-

run "nur" "un c, ruumcml. n c

PAPER-PULP-SCREEN BOX.

JOHNJANSON, OF LAWRECE, MASSACHUSETTS. "Ffm Y Application led February 25, 1907. Serial No. 359,155. i i

To all whom it concern:

Be it known that I, JOHN JANsoN, of Lawrence, county of Essex, State of-Massachusetts, have invented an Improvement in Paper-Pulp-Screen Boxes, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.-

The form of pulp screenordinarily in use in paper making machinery, which comprises a plate having a series of narrow slots therein, becomes clogged from time to time so that it is necessary to clean the slots therein. A It has been customary to secure the screen plates. to a seat formed in a frame or box adjacent the bottom thereof, by means of screws orbolts, so that the plates had to be removed therefrom to be cleaned and so that the removalthereof was a mattei' of considerable difliculty'. As the paper ma- -chine must he shut down while theseplates are being removed and replaced, it is of importance that these plates may be changed as expeditiously as possible.

The objects of my invention are to provide a pulp screen apparatus with means whereby thescreen plates may be so held that there will be no leakage about their. edges, and yet may be readily removed and replaced; and, further, to provide means whereby they may be, at least partially, cleaned without removing them, so that the frequency with which removal for olea-nimy is necessitated, is diminished. I accomplish these objects by the means shown in the accompanying drawing, in which, Figure l is a plan view, partly broken away, of a pulp screen box made according to my invention. Fig. 2 is a side elevation thereof partly in section on the line 2 2 of Fig. 1. Fig. 3`isa transverse section on the line 3 3 of Fig. 1. Fig. 4 is a bottom perspective view of a screen plate made according to my invention. Fig. 5 is an enlarged detail sectional view on line 5 5 of F ig. 1. Fig. 6 is a sectional View on line 3 3 of Fig. 1, showing, my method vof cleaning the screens. The screen )late box or tank which I employ is divide( into a series of compartments, the number oi these compartments depending on the width of the paper machine in connection with which it is used, but for the sake of simplifyinr the illustration a box is shown having only two of such compartments.

As shown in the drawing, a screen plate box is provided comprising a lower section having sides a and a separating partit-ion b,

to divide the same into two compartments,`

the bottom of the chambers thus formed being closed hy a rubber diaphragm c whiohis adapted to be raised and lowered in the usual manner. An outlet a' is provided in the discharge side of each chamber, the under side of said outletbeing on a level with the diaphragm c. A screen seat ff is provided on the upper edge of the-sides c, said .seat extending continuously about the entire box and being surrounded by an upright flange a?. A series of pulpscreen-plates d, of com,- mon form, are adapted to rest at their sides and ends upon sai( seat a.2 and to fit against the flange a3, the upper edge of said flange a3 being on a level with the upper surfaces of said screen plates. As shown 1n the drawing, I preferably employ three of these plates for each compartment of the box, and in such inst-ance provide each compartment of the box with a pair of cross bars e, the upper surfaces, of which are flush and eontinuou with the' seat a2.

All of the screen plates, except those at the ends of the box, are provided on their under sides with transversely extending, dove-tail tongues d', one tongue being provided `at each side of each plate approximately in the middle thereof, and the cross bars e, and partition b are each provided with a correspondingly shaped groove e adapted and disposed to receive said tongues. Y

The distances between the cross bars e and the separating partition b are substantially the same as the width of the screen plates, so that said plates may be moved into such a. position thatvthe joints between the meeting edges of theplates will be approximately above the middle of the cross bars e. and partition b In this position the tongues al will be located in the grooves e of the bars e, the

o n. n Specification of Letters Patent. j Patented SeptT22,"1908."-'

length ,of said tongues beingpreferably half a would prevent the plates from being clamped tightly thereon, and they are iinnecessary, as will hereafter appear.

An'upper tank section or frame is arranged abe-ve said plates to )ro"it.e a receiving chamber therefor, said frame being composed of four side walls of the same shape as the sides of the lower section u, and adapted torest, when in place, upon the edges of the screen plates directly above the seat a?, so that when 'it is cla..iped thereon, by means of side bolts y, a tight joint will be made oetween said frame and the plates and between the plates and the sea-t a?. In prac# tice the under edge of said frame and said seat are provided with rubber packing to make the joint )erfectly tight. K'lhe frauiej' is further provii ed with a series of depending rack bals or arms r which are. rigidly secured at their upper ends to o )posit-e sides of said frame, two arms on eacli side being shown. An operating shaft i is journaled on the sides a atI one end thereof, said shaft being provided with beveled gears j and adjacent its ends, adapted to mesh with corresponding beveled gears m and 'nrespectively mounted on the ends of shaft-s o and p,journaled on opposite sides of said lower section. Said shafts o and are each provided with a pair, of pinions g t isposed to engage the rack bars i, so that, when said shaft i is rotated, said shafts o and fp will also be rotated and will cause the pinions q to engage the rack bars .7i and to lift the framef ont of engagement with the screen plates, as indicated in dotted lines in F ig. 3. A hand wheel 1' is provided on the end of the shaft i, as a convenient means for turning the saine, and a ratchet s is also provided thereon, with which a pawl t is adapted to engage to hohl the frame fin the various positions to which it may oe lifted. In n'act-ice, therefore, if it. is desired to remove tlhe screen plates, it is merely necessary, rst to release the clamping bolts y, i

and then to turn the shaft i so as to raise -the frame f to the desired extent. The cnil piates :nay then be lifted directly from their seats and then the other plates may be also lifted out after sliding them far enough to disengage their tongues from the cross bars.

With the above described construction the planes with relation to the section or frame a, which supports it, as it is raised or lowered, so that a practically unobstructed space of uniform width is. provided, when the frame is raised, between the meeting edges of said frames at all sides through which the screen plate may be'readily cleaned, as hereafter 1 described. s the frame f is liel'd in parallel planes, when it is lowered the lower edges thereof will simultaneously come into cngageinent with the seat therefor on the supporting frame.

In case it is desired to clean the slots in the plate without removing them, a nozzle .v is

inserted inthe outlet e as indicated in Fig. Y

l water has risen a short distance above the level of the surface of the screen plates, so that, the ebstructions which are washed out of the screen slots will be floating in the water above the plates, the framcfwill be lifted a few inches and this water and the matter held in suspension will be washed off with a. hose pipe. The upper surfaces of the plates may also be conveniently washed and scraped and, as thc sides of the lower section do not extend above the level of the plates, all of the waste matter may be readily removed witheut removing the plates.

In washing out the slots in the screen plates by forcing water back therethrough,

A the pressure on the under side of the plates f and tli'eir tongue and groove connections with the ncivt adjacent plates.

llaving thus described my invention, what I claim as new and desire to secure by Letters Patent is:`

1. In a pulp screen apparatus, the combination of a supporting frame having a screen plate at its top, a. single side-wall frame resting on said supporting frame to form apul receiving chamber, a. plurality of uprig it supports remotely disposed relative to each other at each side o f said frames, and means engaging said sull ports for raising and lowering said side-wal. frame with relation to said supporting frame, to provide unobstructed cleaning spaces for the screen plate between side-wall frame f will be held in parallel4 moving them longitudinally to raise andv In this manner an upward low. is,

ine 

